Process of making adhesives.



- UNITED STATES PATENT OFFICE.

CHARLES BRUEDER, OF ARCHES, FRANCE.

PROCESS OF MAKING ADHESIVES.

SPECIFICATION forming part of Letters Patent No. 646,724, dated April 3,1900. Application filed a uary 1 3 Serial No. 703,578. (No specimens.)

To all whom it may concern:

Be it known that I, CHARLES BRUEDER, a citizen of the Empire of Germany,residing at Arches, 'Vosges, in the Republic of France, have inventedcertain new and useful Improvements in Processes of Treating AmylaceousSubstances, of which the following is'a specification.

Alkaline chlorites and hypochlorites in an alkaline medium under specialconditions transform common feculae and starches into a gelatinousproduct.

My invention consists in the treatment of such feculze or otheramylaceous matters by means of alkaline chlorites or hypochlorites orthe like for the purpose of obtaining a gummy and gelatinous productpossessing all the properties of and being suitable for the sameindustrial purposesas animal gelatin.

In carrying my invention into practice, for example, one thousand kilosof feculee are dissolved in eight hundred to nine hundred liters ofwater containing one thousand liters of a chlorite orhypochlorite-suchas, for instance, the ordinary liquid potassiumhypochlorite. The reaction takes from one and a half to two hours. Inorder, however, to allowthe product to thoroughly settle, the solutionshould be permitted to thereafter. It is then decanted and the residueallowed to dry. Thelatter'is then heated at a temperature of from to 100centigrade until entirely dry. The resultant product is of a veryexcellent white color and is soluble in water-like gelatin. It possessesall theindustrial properties of the latter. Ordinary sodium hypochloritemay be used in place of the potassium hypochlorite. The chemicalreaction which takes place under these circumstances is absolutelynovel. The starches employed usually contain sulfurous acid. Beforesubjecting the substances, therefore, to the action of the hypochloritethis sulfurous acid is neutralized and transformed by treatment withsodium peroxid into neutral sodium sulfate. Thesulfurous acid if allowedto remain in the amylaceous matters to be treated would decompose thehypochlorite and liberate chlorin, and the product obtained under theseconditions not only would have none of the properties of gelatin, but itwould, moreover, contain free chlorin. On the other hand, by operatingin an alkaline medium the This solution is allowed to stand.

stand for about twelve hours product after having been dried presents aweak alkaline reaction without any trace of free chlorin. The productmade in this manner after heating with water for use contains onlycalcium or potassium chlorid. For starching dyed materials of delicateshades it will suifice to neutralize the solution by traces of aceticacid.

It should be understood that too great a degree of alkalinity preventsor retards the transformation of the amylaceous matter by the chloriteor hypochlorite.

A characteristicof the product obtained by this process of treatment isto give, when it is heated in the proportion of twenty to fifty percent. of the weight of water used, gluelike substances which thicken fora few moments, then become fluid, and contain no traces of free chlorin,but simply of sodium or potassium chlorid.

I reserve to myself the right of altering the proportions and thetemperatures above set forth according to the products to be obtained.

Having thus described my invention, I

claim as new and desire to secure by Letters Patenta 1. Theherein-described process of treating amylaceous substances, whichconsists in subjecting feculee or other am ylaceous substances to theaction of an alkaline chlorite or hypochlorite, substantially as setforth.

2. The herein-described process of treating am ylaceous substances,which consists in neutralizing the acid properties of the same, andsubjecting the so-neutralized substances to the action of an alkalinechlorite or hypochlorite, substantially as set forth.

3. A new orimproved process for the manufacture of an adhesive materialextracted from starch, and utilizable in the same man ner as commonglue, this process consisting in treating starch with a solution ofchlorite or hypochlorite of potash or of soda, after which the mass isallowed to stand, and subsequently decanting and drying the same,substantially as set forth.

In testimony that I claim the foregoing as my invention I have signed myname in presence of two subscribing witnesses.

OH. BRUEDER.

Witnesses HUGUENOT LOUIS, PIERRE GYARYON.

